How this is done by soldering.
http://www.sterpin.net/uk/PowerPowerbookG3Kangauk.htm
Shut down the iBook, and put it on a smooth and clean surface.
http://www.faqintosh.com/risorse/en/guides/hw/ibook/ram/
Apple has truly made it easy to upgrade the latest iMac.
http://www.gearlive.com/index.php/news/article/imac-core-duo-easiest-ram-installation-ever-01271218/
This procedure will void waranty with Apple
http://home.comcast.net/~woojo/DFFA53A0-F23D-4541-9015-481FD3B6532E/iMac_Disassembly.html
all white iBook models
http://www.faqintosh.com/risorse/en/guides/hw/ibook/hingelube/
Powerbook G3/400 Firewire processor card upgraded to G3/900 (750fx) by PowerLogix.
http://www.sterpin.net/uk/pismologixuk.htm
Fortunately, replacement of the batteries is fairly simple if you have the right tools and half an hour to burn.
http://www.r3uk.co.uk/content/view/127/61/
This is a very tricky procedure, both in terms of the actual disassembly and the repair.
http://www.r3uk.co.uk/content/view/49/61/
y2006 DualCore iMac
http://www.faqintosh.com/risorse/en/guides/hw/imac/imacdcram/
iMac G4 17", 1GHz
http://www.faqintosh.com/risorse/en/guides/hw/imac/g417hd/